You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Please help me to book a flight ticket from IAH to SFO.

ASSISTANT: Sure, can you share your travel dates please?

USER: My journey dates are from May, 14 to May, 16.

ASSISTANT: May I know your good name?

USER: Barbara Baker.

ASSISTANT: Please share your connection limit.

USER: I need  a single connecting flight.

ASSISTANT: Is there any more specifications for you?

USER: No.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.