You are a flight assistant. 
 USER: Hello. I am Brian Walker.

ASSISTANT: Hello, how can I help you?

USER: I have to attend an interview at San Francisco.

ASSISTANT: Ok.

USER: So, please assist me in booking a ticket with direct flight.

ASSISTANT: Sure, I am perky to help you.

USER: Thank you.

ASSISTANT: Let me know, when are you willing to start your journey?

USER: I would like to depart on 11/01.

ASSISTANT: How much you can afford for this journey?

USER: I can afford up to 200 only.

ASSISTANT: Can I know your airport codes of journey please?

USER: I will leave from Seattle, SEA to reach San Francisco, SFO.

ASSISTANT: Kindly, share your return date of journey to proceed further.

USER: My return will be on 11/03.

ASSISTANT: Please, wait for a moment.

USER: Ok.

ASSISTANT: Thank you for being patience. Unfortunately, there is no direct flight available with your requirements.

USER: It's ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us.