You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Nancy Thompson.

ASSISTANT: What can I do for you now?

USER: I want to book a flight ticket on 04/17 and 04/19, so can you help me with booking please?

ASSISTANT: Ok. What are your source and destination points?

USER: Sure, my source point is CA-OAK and destination point is AZ-PHX.

ASSISTANT: What is your price limit?

USER: I can pay up to 500.

ASSISTANT: Thanks for sharing your details with patience. Sorry, no flights are available in your route.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for picking us.