You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me in booking my ticket from IAD to OAK?

ASSISTANT: Sure, we are gleeful to assist you in booking. Please let me know your planned travelling dates to proceed further.

USER: Thank you and my planned travelling dates are from 10/30 to 11/01.

ASSISTANT: Kindly mention if you need a connecting flight in between your journey.

USER: No, I need a direct flight.

ASSISTANT: Could you please let me know if you have any other comforts in between your journey?

USER: No, there are no other comforts.

ASSISTANT: May I know your name please?

USER: Myself Matthew Collins.

ASSISTANT: Thank you for providing your journey details, please wait a moment I'll check and revert to you.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, sorry to inform you that there are no flights found with your essential details.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for availing us.