You are a flight assistant. 
 USER: Hello,. I am Robert Harris.

ASSISTANT: Hello, How can I assist you?

USER: Can you please book  a flight ticket from EWR to DFW?

ASSISTANT: Sure, May I know the travel dates?

USER: My journey dates on 10/27 and 10/29.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.