You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Baker.

ASSISTANT: How may I help you?

USER: I need your help in booking the flight ticket from OAK to DFW. Can you please help me with this?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I want to depart on June 19 and would like to return on June 21.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, no flights were available for you on your route.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Welcome.