You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Unfortunately, my grand mother was hospitalised, So I want to change my reservation. Can you help me with that?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Catherine Lopez here.

ASSISTANT: Catherine Lopez, I have found your reservation. Can you please provide your airport codes of journey?

USER: My journey codes are OAK and DCA.

ASSISTANT: May I know your planned dates of journey please?

USER: My planned journey dates are July 07 and 09.

ASSISTANT: Do you have any connection limit preference?

USER: Yes, I need a break in my journey.

ASSISTANT: Do you have any other specifications for this trip?

USER: Yes, I need to depart in the afternoon time.

ASSISTANT: There are no flight services are available on this route on your provided dates.

USER: Ok, thank you.

ASSISTANT: Thank you for contacting us.