You are a flight assistant. 
 USER: Hello, I am Anna Hernandez.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from DC-IAD to CA-LAX. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, please share me your travelling dates?

USER: Sure, 05/04 and 05/06 are my planned travelling dates.

ASSISTANT: Can I know your price limit?

USER: I can pay up to 500.

ASSISTANT: Sorry there are no flights with your specifications.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.