You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I would like to travel from IAH to SFO. Can you please help me in this?

ASSISTANT: Sure, May I know the travelling dates?

USER: My trip dates are from 02/15 to 02/17.

ASSISTANT: Do you have any connection limit?

USER: I want a single connection.

ASSISTANT: Is there any other requirements?

USER: no, thank you.

ASSISTANT: May I know your name?

USER: Myself Margaret Williams.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's fine, thank you.

ASSISTANT: Thank you for opting us.