You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Melissa Baker here. I want to book a ticket from IAH to SFO. Could you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates to book a flight ticket?

USER: My travelling dates are from 03/09 to 03/11.

ASSISTANT: Ok, wait for a while. Thanks for waiting there are no flights found on your details.

USER: Ok. Thank you.

ASSISTANT: Thanks for approaching us.