You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Melissa Taylor.

ASSISTANT: How may I amend you today?

USER: I would like to book a flight ticket from Houston, to attend the seminar which is in Oakland.

ASSISTANT: Ok.

USER: Can you please help me in making an airline reservation?

ASSISTANT: Sure, I will help you out. Can you mention the airport codes of both routes?

USER: My boarding point is Houston TX-HOU and landing point is Oakland CA-OAK.

ASSISTANT: Ok. May I have your travel dates?

USER: My departure date is 06/14 and arrival date is 06/16.

ASSISTANT: Ok. Do you have any other specifications?

USER: I need a halt. I can expend upto 500.

ASSISTANT: Ok. Thanks for sharing your details, but no connecting flight is available on particular routes.

USER: Ok, no issues at all.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.