You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Margaret Lewis here.

ASSISTANT: Hello Lewis.

USER: I would like to travel from PHL to LAX, could you please help me in booking a ticket?

ASSISTANT: Sure, may I know your preferable dates of travelling?

USER: My trip dates are from 03/02 till 03/04.

ASSISTANT: Please wait a moment to check the flight availability and I will get back to you.

USER: Ok, take your own time.

ASSISTANT: Sorry Lewis, there are no flights found with your requested dates of travelling.

USER: It's ok. Thank you for checking.

ASSISTANT: Ok, thank you for using our service, have a great day.