You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: Edward Walker is here.

ASSISTANT: How may I help you?

USER: Help me in booking a flight ticket under a fare of 500 to Oakland.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: In order to book a flight ticket, please provide airport codes?

USER: Ok, Houston, TX - HOU is my source and OAk is my destination code.

ASSISTANT: May I know your travel dates?

USER: My travel dates are as 01/16 to 01/18.

ASSISTANT: Please provide flight connections limit?

USER: Connection limit is one.

ASSISTANT: Ok. No flight found with your requirement.

USER: No problem, I will try with another.

ASSISTANT: Thanks.

USER: Thanks for the information.