You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Mary Gonzalez want to visit Houston, can you book a ticket from OAK to IAH?

ASSISTANT: Sure, could you please share me with your dates of journey?

USER: Sure, my travelling dates will be 05/06 and 05/08.

ASSISTANT: Please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry Mary, there is no flight found as per your travelling details.

USER: That's ok, thank you.

ASSISTANT: You are welcome and have a happy journey.