You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Myself Joshua Martinez. I would like to meet my friend at Dallas, will you help me in booking the flight ticket from OAK to DFW?

ASSISTANT: Can you please mention your travelling dates?

USER: My journey dates are 07/15 and 07/17.

ASSISTANT: Please wait a moment, let me check with your details.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Joshua, there are no flight tickets available in which you are travelling.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing our service.