You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Moor.

ASSISTANT: How may I help you?

USER: I want to travel from PHL  to DFW for my cousin engagement, can you help in booking a flight ticket?

ASSISTANT: Ok. May I know your dates of journey?

USER: My date of journey is on 09/30 to 10/02.

ASSISTANT: Please wait for a moment. There are no flights matching with your requirements.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for approaching us.