You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela Lewis.

ASSISTANT: How can I help you today?

USER: On a business trip, I want to travel Oakland-OAK from my home region Houston-IAH, can you find a flight for me?

ASSISTANT: Sure, I can help you in booking flight ticket. Can you please let me know your travel dates for booking flight ticket?

USER: The travelling dates are 02/25 and 02/27.

ASSISTANT: Ok, please wait a moment, I will check flight availability.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, no flights available as per your requested dates.

USER: It's alright, I will go with my friend to reach my destination. Thank you for your hand help.

ASSISTANT: Thank you for reaching us, have a nice day.