You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Mary Hill. I have to attend a Live Concert at San Francisco, could you please help me with booking a flight ticket from IAH to SFO?

ASSISTANT: Sure, I am here to help you. Could you please provide your travelling dates to search for the flight?

USER: I would like to take off on 04/23 and return on 04/25.

ASSISTANT: Ok, please wait for a moment I will check for the available flights.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights were available on your route.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.