You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am John Jackson. I am planning to travel from CLT to SFO, can you help in booking a flight for me?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My date of travelling is on 12/27 to 12/29.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: proceed for booking.

ASSISTANT: Sorry, there is no flight available at your requested dates.

USER: that's ok.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Thank you for your help.