You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gary Wilson.

ASSISTANT: How can I help you today?

USER: Could you please help me to book an economy class ticket within the fare limit 200 to Los Angeles?

ASSISTANT: Sure, please mention your nearest airport codes.

USER: My boarding and landing airport codes are IAD and LAX.

ASSISTANT: I need to know your trip dates?

USER: I need to depart on May 2nd and my return date will be on May 4.

ASSISTANT: Ok, wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for reaching us.