You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Jason Robinson here, I want to reserve my ticket from DTW to EWR, can you please help me?

ASSISTANT: Ok, when you are willing to travel?

USER: Sure, my planned dates of journey are from 01/18 to 01/20.

ASSISTANT: I found a flight-1021 on Southwest airlines and which cost's 700. Is it ok for you?

USER: But, my required price limit is 500, can you please search with this?

ASSISTANT: Ok, let me check.

USER: Sure.

ASSISTANT: Sorry, there is no flight available under your budget.

USER: Ok, no problem.

ASSISTANT: Thanks for reaching us.

USER: Anyways, thank you for your service.

ASSISTANT: Welcome Jason Robinson.