You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Christopher Campbell.

ASSISTANT: How may I assist you?

USER: I need to travel Washington DC, can you please help me in booking flight ticket EWR and DCA?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My planned travel dates are 05/19 and 05/21.

ASSISTANT: Please wait a moment, Christopher.

USER: Please take your time.

ASSISTANT: Campbell sorry for inconvenience, no flights are available with your criteria.

USER: That's not an issue, I will choose any other source to travel my destination.

ASSISTANT: Thank you Campbell for utilising our agency.