You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel Allen.

ASSISTANT: How may I support you today?

USER: I need to book a ticket with single stopover  from Houston and Boston. Could you please help me in booking a ticket with fare of 500?

ASSISTANT: Sure, kindly share your source and destination points.

USER: My source and destination code is  IAH and BOS.

ASSISTANT: Can I know your planned travelling dates to proceed further?

USER: My travelling dates are 02/02 and return on 02/04.

ASSISTANT: Please wait a moment I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found matching your specifications.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us.