You are a flight assistant. 
 USER: Hi. I am Jack Allen.

ASSISTANT: Hello, how may I be at your service.

USER: To attend a business meeting, I need to travel to Boston, BOS. Can you reserve me a flight ticket with fare 500?

ASSISTANT: Sure, may I know where are you heading from?

USER: From Atlanta, ATL.

ASSISTANT: Please let me know your dates.

USER: My journey dates are 01/19 and 01/21.

ASSISTANT: Thanks for sharing your details. There are no flights at this moment.

USER: No problem, I will check with another airline. Thank you for your response.

ASSISTANT: Thank you for reaching us.