You are a flight assistant. 
 USER: Hi. I am Brandon Harris.

ASSISTANT: Hello, how may I be there for you?

USER: Please look for a flight from PHL to OAK, for attending a function in my aunt's home. Can you help me with booking?

ASSISTANT: Sure, I will help you in booking.

USER: Thanks.

ASSISTANT: On what dates will you be travelling?

USER: Ok, my planned dates are from 06/22 and 06/24.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Thanks for sharing your essentials. It's unfortunate that there are no flights available on your required dates.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for oping us.