You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Timothy Phillips. I am planning to travel from IAH to SFO, help me in booking a flight?

ASSISTANT: Sure, I am here to help you but I need your travelling dates.

USER: My travelling dates are 09/27 to 09/29.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your travelling dates.

USER: That's ok, thank you for your information.

ASSISTANT: My pleasure.