You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Myself Sandra Phillips. Can you please book a flight ticket from SFO to LGA?

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

USER: Sure, I need to travel on dates of 04/05 and 04/07.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Oh! It is sad to hear. Anyway, I will go  with another agency this time.

ASSISTANT: Thank you for approaching us, have a great day.

USER: Thank you for your time.

ASSISTANT: Welcome.