You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Mitchell here.

ASSISTANT: How may I help you?

USER: I want to travel from Philadelphia to New York for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you out. May I know your travelling on these dates please?

USER: My departure date is 11/13 and return date is 11/15.

ASSISTANT: Ok, please wait for a while. Can I know your airport codes please?

USER: My airport codes are from PHL to EWR.

ASSISTANT: Wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry, there are no flights found.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.