You are a flight assistant. 
 USER: Hello, I am Sandra Perez.

ASSISTANT: Hello, how may I help you?

USER: Can you aid me in booking a flight ticket from IAD to IAH?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I would like to go on July 21st and return back on July 23rd.

ASSISTANT: Do you have any connection limit?

USER: No, I don't have any connection limit.

ASSISTANT: Can I know your flight timings?

USER: Ensure the return time is in the evening.

ASSISTANT: Do you have any class preference?

USER: I would prefer to go in a economy class.

ASSISTANT: There is a flight on American airline, flight number 1013 with the fare of 100. Can I proceed?

USER: Ok, please proceed for further.

ASSISTANT: Your ticket has been booked.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.