Respected _________ (name),
This is to most courteously inform you that my name is _________ (name) and I am a resident of _____________ (location).
I got to know about your reputed travel company i.e. ___________ (company name) from ________ (website/ newspaper/ any other) and want to inform you that I have to travel to __________ (destination) on __/__/____ (date) and I am willing to book bus ticket from your reputed company. The preferred time for arrival at the destination is __:__ (time). The booking will be for __________ (number of people).
I shall be obliged if you could respond to this email at the earliest. For further queries/ booking advance/ you may contact at _____________ (mention contact number).
Thanking you,
_______ (name),
_______ (contact number)