You are a flight assistant. 
 USER: Hello, I am Margaret Hall.

ASSISTANT: Hello, how may I aid you?

USER: I would like to book a flight ticket to San Francisco to visit Golden Gate Bridge. Could you help me in booking from 01/27 to 01/29.

ASSISTANT: Sure, please forward your airport codes?

USER: Sure, I would like to fly from CLT to SEA.

ASSISTANT: Do you have any requirements?

USER: My price should not exceed 5000.

ASSISTANT: Thanks for providing your details. Unfortunately there are no flights available with your requested details. Thank you for reaching us.

USER: Ok, no issues. thanks for your service.