You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: David Turner here.

ASSISTANT: How may I help you?

USER: Please help me out in booking the ticket from PHL to EWR.

ASSISTANT: Can I know your travelling dates?

USER: My trip dates will be Feb 26 to Fen 28.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: That's ok, thank you for informing.

ASSISTANT: Thanks.