You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Williams Thompson here, I want to reserve my ticket from DFW to EWR, can you please help me?

ASSISTANT: Can you please share your journey dates?

USER: Sure, my preferable dates of journey is from 06/23 to 06/25. Please make sure that the price limit is 200.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait.

ASSISTANT: I am sorry to say that there is no flight found.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Anyways, thank you for your service.