You are a flight assistant. 
 USER: Hi, I am Christopher Lewis.

ASSISTANT: Hello, how may I assist you?

USER: I want to travel from Philadelphia, PA - PHL to New York, EWR to meet my colleague.

ASSISTANT: Ok, may I know your journey dates?

USER: I would start on 08/20 and return on 08/22.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, There are no flights found with your required details. Thanks for reaching us.

USER: Ok, thanks for your response.