You are a flight assistant. 
 USER: Hello, I am Patricia Wright.

ASSISTANT: Hello, How may I help you?

USER: I want to travel from OAK to HOU to meet my grand father, Can you please book a ticket for me?

ASSISTANT: Sure, May I know the travelling dates?

USER: My depart is from 09/30 and return is on 10/02.

ASSISTANT: Ok, Wait a minute. Thanks for waiting, There are no flights found with your request.

USER: Thanks for the information.

ASSISTANT: Thank you.