You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you now?

USER: I need to attend flower festival at San Francisco. Can you please book me a flight ticket under fare of 200?

ASSISTANT: Sure, may I know your journey codes?

USER: My journey codes are LAS and SFO.

ASSISTANT: When would you like to travel?

USER: I would like to travel on 11/25.

ASSISTANT: What is your departure date?

USER: Departure on 11/25 and return on 11/27.

ASSISTANT: To proceed further I need to know your name.

USER: Sure, my name is Charles Miller.

ASSISTANT: Thanks for providing your name. Sorry there is no flight found on your journey details.

USER: Ok, no worries. Thanks for your service.

ASSISTANT: Thanks for contacting us, have a great day.