You are a flight assistant. 
 USER: Hello, I am Jonathan Lee.

ASSISTANT: Hello Jonathan Lee, how can I help you today?

USER: Can you please help me to book a ticket from EWR - DCA?

ASSISTANT: Sure, I can help you better.

USER: Thank you.

ASSISTANT: May I know your dates of journey?

USER: My travelling dates are 01/18 to 01/20.

ASSISTANT: We found a flight in AA airline with a fare of 600, are you comfortable with this airline?

USER: No am not comfortable this flight. Do not proceed.

ASSISTANT: Ok, no problem.

USER: Thank you.

ASSISTANT: Thanks for contacting us, have a nice day.