You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Nelson.

ASSISTANT: How may I serve you now?

USER: I need to book a ticket to meet my grandfather for my medical checkup. Could you please help me in doing that?

ASSISTANT: Ok. Can I have your journey dates?

USER: My travelling dates are 11/24 and return on 11/26.

ASSISTANT: Help me with your airport codes.

USER: My airport codes are SFO and EWR.

ASSISTANT: Kindly mention your specifications.

USER: Price should be below 200.

ASSISTANT: Thanks for your time. Unfortunately, we have no flights that matches with your information.

USER: No problem, thank you for your information.

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