You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you help me in doing a reservation from IAH to SFO?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: My trip dates are July 05 to 07.

ASSISTANT: May I know your name to book the flight ticket?

USER: Nancy Lee here.

ASSISTANT: Are you ok with connecting flight?

USER: Ok.

ASSISTANT: Any other preferences do you have?

USER: No.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure, take your time.

ASSISTANT: We are apologize that, there are no flights running towards your region with your requested dates of travelling.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for approaching us, hope you have a great day.